DETROIT (AP) — Ford is recalling more than 680,000 midsize sedans mainly in North America because the front seat belts may not hold people in a crash.

The recall covers certain 2013 to 2016 Ford Fusion, 2013 to 2015 Lincoln MKZ and 2015 and 2016 Ford Mondeo cars.

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Check Ford Recall Website

Ford says heat generated when the seat belt pre-tensioners deploy can cause cables to break. If that happens the belts may not hold people. Ford says it knows of two injuries related to the problem.

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Pre-tensioners tighten seat belts when they sense that cars are stopping.

Dealers will inject insulation into the pre-tensioners to protect the cables from heat at no cost to owners. The recall is expected to begin on Jan. 16.

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Most of the cars are in the U.S., Canada and Mexico.